Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Akihito Nakazaki

Yusuke Konno

Nobuhiro Furuya

Atsuhiro Hibi

Toshio Akagi

Takamichi Kobayashi

Takayuki Sonoda

Tomohiro Kuroiwa

To reliably measure a surface of an object to be measured having a wide width. A surface measurement apparatus that measures a surface of an object to be measured moving in a predetermined moving direction on a plane or a surface of an object to be measured moving in a predetermined moving direction along a curved surface of a roll, the surface being along the curved surface, the apparatus includes: N (N being an integer of two or more) light sources provided in a width direction, the light sources each emitting line beam over the width direction, which is a direction perpendicular to the moving direction; a screen on which reflected images of N pieces of the line beam reflected on reflection regions of the surface of the object to be measured respectively are projected; an image capturing device that captures the reflected image projected on the screen and acquires a captured image; and an arithmetic processing device that measures the surface of the object to be measured by using the captured image, in which the reflected images are projected on the screen to be distinguishable from each other.

Surface measurement apparatus and surface measurement method

A shape measurement apparatus includes: a linear light source that includes a superluminescent diode and applies linear light spreading in a width direction of the strip-shaped body to a surface of the strip-shaped body; a screen on which reflected light of the linear light off the surface of the strip-shaped body is projected; an area camera that captures an image of the reflected light of the linear light projected on the screen; and an arithmetic processing apparatus that calculates the surface shape of the strip-shaped body using the captured image of the reflected light of the linear light captured by the area camera.

Shape measurement apparatus and shape measurement method

[Object] To provide a shape measurement apparatus that is capable of detecting minute roughness irregularity at high speed across the entire width on the entire surface of a measurement object. [Solution] Provided is a shape measurement apparatus including: a light source configured to irradiate a surface of a moving strip-shaped body with linear light diagonally from an upstream side in a movement direction of the strip-shaped body; a screen configured such that reflected light of the linear light on the surface of the strip-shaped body is projected on the screen; an imaging unit configured to image the reflected light of the linear light projected on the screen; and an arithmetic processing unit configured to acquire surface roughness distribution of the strip-shaped body on the basis of width distribution of a light strip of the reflected light of the linear light projected on the screen. The angle of incidence of the light source with respect to the strip-shaped body is set in accordance with target surface roughness of the surface of the strip-shaped body.

An inspection object imaging apparatus includes: a light source configured to produce a light beam belonging to an infrared wavelength band and having a predetermined spread half-angle on a surface of an inspection object; a projection optical system to project the light beam on the surface of the inspection object at a predetermined projection angle; and an imaging unit. The imaging unit includes an imaging optical system configured to condense reflected light and branch the reflected light to two different directions, and a first image sensor and a second image sensor, the first image sensor positioned on the inspection object side with respect to a position of the imaging optical system that is conjugate with the surface of the inspection object, along an optical axis of the reflected light, and the second image sensor positioned on the reflected-light travel direction side with respect to the conjugate position.

Inspection object imaging apparatus, inspection object imaging method, surface inspection apparatus, and surface inspection method

[Object] To provide a shape measurement apparatus that is capable of measuring the amount of warpage in the width direction of a strip-shaped body with higher sensitivity. [Solution] Provided is a shape measurement apparatus including: a light source configured to irradiate a surface of a moving strip-shaped body with linear light at a prescribed angle of incidence; a screen configured such that reflected light of the linear light on the surface of the strip-shaped body is projected on the screen; an imaging unit configured to image the reflected light of the linear light projected on the screen; and an arithmetic processing unit configured to acquire the amount of warpage in a width direction of the strip-shaped body on the basis of a line length of the reflected light of the linear light imaged by the imaging unit.

Growing community of inventors

Tokyo, Japan

Akihito Nakazaki